:root {
    --primary: #0ea5e9;
    --primary-dark: #0284c7;
    --secondary: #06b6d4;
    --accent: #8b5cf6;
    --success: #10b981;
    --warning: #f59e0b;

    --bg-primary: #0b0f14;
    --bg-secondary: #10151d;
    --bg-tertiary: #141b25;
    --bg-card: rgba(16, 21, 29, 0.88);
    --bg-glass: rgba(11, 15, 20, 0.78);

    --text-primary: #ffffff;
    --text-secondary: #d8e1ea;
    --text-muted: #64748b;
    --text-accent: var(--primary);

    --border: rgba(30, 41, 59, 0.5);
    --border-light: rgba(100, 116, 139, 0.22);
    --border-accent: rgba(14, 165, 233, 0.35);

    --shadow-sm: 0 4px 10px rgba(0,0,0,.18);
    --shadow-md: 0 10px 28px rgba(0,0,0,.22);
    --shadow-lg: 0 24px 50px rgba(0,0,0,.28);
    --shadow-xl: 0 36px 70px rgba(0,0,0,.34);

    --gradient-primary: linear-gradient(135deg, #0ea5e9 0%, #3b82f6 50%, #8b5cf6 100%);
    --gradient-secondary: linear-gradient(135deg, #06b6d4 0%, #0ea5e9 100%);
    --gradient-accent: linear-gradient(135deg, #8b5cf6 0%, #06b6d4 100%);

    --animation-fast: .18s cubic-bezier(.4,0,.2,1);
    --animation-normal: .28s cubic-bezier(.4,0,.2,1);
    --animation-slow: .48s cubic-bezier(.4,0,.2,1);
    --animation-bounce: .6s cubic-bezier(.68,-.55,.265,1.55);

    --header-height: 64px;

    --radius: 14px;
    --radius-sm: 10px;
    --blur: 16px;

    --btn-primary: #0ea5e91a;
}

a:focus-visible,
button:focus-visible,
.nav-link:focus-visible,
.btn:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
html {
    scroll-behavior: smooth;
    overflow-x: hidden;
    color-scheme: dark;
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
    * {
        animation-duration: .001ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: .001ms !important;
    }
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    overflow-x: hidden;
    font-weight: 400;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body::before {
    content: "";
    position: fixed;
    inset: 0;
    z-index: -1;
    pointer-events: none;
    background:
        repeating-linear-gradient(to right, rgba(216,225,234,.06) 0 1px, transparent 1px 80px),
        repeating-linear-gradient(to bottom, rgba(216,225,234,.06) 0 1px, transparent 1px 80px),
        repeating-linear-gradient(to right, rgba(216,225,234,.025) 0 1px, transparent 1px 16px),
        repeating-linear-gradient(to bottom, rgba(216,225,234,.025) 0 1px, transparent 1px 16px);
    -webkit-mask-image: linear-gradient(#000, transparent 85%);
    mask-image: linear-gradient(#000, transparent 85%);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}
.container-wide {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.text-gradient {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Surfaces / cards / glass */
.glass-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: var(--shadow-md);
}

.surface {
    background: var(--bg-glass);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    backdrop-filter: blur(var(--blur));
    -webkit-backdrop-filter: blur(var(--blur));
}

.elevate-sm {
    box-shadow: var(--shadow-sm);
}
.elevate-md {
    box-shadow: var(--shadow-md);
}
.elevate-lg {
    box-shadow: var(--shadow-lg);
}

.section-padding {
    padding: 6rem 0;
}

.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: all .8s cubic-bezier(.4,0,.2,1);
}
.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: .5rem;
    padding: .875rem 1.75rem;
    border-radius: 9999px;
    font-weight: 600;
    font-size: .95rem;
    line-height: 1;
    text-decoration: none;
    cursor: pointer;
    border: 1px solid transparent;
    outline: none;
    transition: all var(--animation-normal);
}
.btn-primary {
    background: var(--gradient-primary);
    color: #fff;
    box-shadow: 0 8px 25px rgba(14,165,233,.3);
}
.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 35px rgba(14,165,233,.4);
}

.btn-secondary {
    background: rgba(14,165,233,.1);
    color: var(--primary);
    border: 1px solid var(--border-accent);
    backdrop-filter: blur(10px);
}
.btn-secondary:hover {
    background: rgba(14,165,233,.2);
    transform: translateY(-1px);
    border-color: var(--primary);
}

.btn-small {
    padding: .625rem 1.25rem;
    font-size: .85rem;
}
.btn-large {
    padding: 1.125rem 2rem;
    font-size: 1.05rem;
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: .5rem;
    padding: .25rem .5rem;
    border-radius: 999px;
    font-size: .8rem;
    font-weight: 600;
    background: rgba(14,165,233,.1);
    color: var(--text-secondary);
    border: var(--border-accent);
    backdrop-filter: blur(10px);
}

.header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 1000;
  background: var(--bg-glass);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-light);
  transition: all var(--animation-normal);
}
.header.scrolled {
    background: rgba(15, 23, 42, .95);
    box-shadow: var(--shadow-lg);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 0;
    min-height: 4rem;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: .5rem;
}
.logo i {
    color: var(--primary);
}

.nav {
    display: flex;
    align-items: center;
    gap: 2rem;
}
.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: .9rem;
    position: relative;
    padding: .5rem 0;
    transition: all var(--animation-normal);
}
.nav-link::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width var(--animation-normal);
}
.nav-link:hover {
    color: var(--primary);
}
.nav-link:hover::after, .nav-link.active::after {
    width: 100%;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.5rem;
    cursor: pointer;
    transition: color var(--animation-normal);
}
.mobile-menu-btn:hover {
    color: var(--primary);
}

.mobile-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-glass);
    backdrop-filter: blur(24px);
    border-bottom: 1px solid var(--border-light);
    padding: 1rem 0;
}
.mobile-nav.open {
    display: block;
}
.mobile-nav-link {
    display: block;
    color: var(--text-secondary);
    text-decoration: none;
    padding: .75rem 1.5rem;
    font-weight: 500;
    transition: all var(--animation-normal);
}
.mobile-nav-link:hover {
    color: var(--primary);
    background: rgba(14, 165, 233, .1);
}

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
    background: radial-gradient(ellipse 80% 60% at 50% 0%, rgba(14,165,233,.1) 0%, transparent 70%);
}
.hero::before {
    content: "";
    position: absolute;
    inset: 0;
    height: 120%;
    background:
        radial-gradient(circle at 20% 50%, rgba(139,92,246,.1) 0%, transparent 40%),
        radial-gradient(circle at 80% 20%, rgba(6,182,212,.1) 0%, transparent 40%),
        radial-gradient(circle at 40% 80%, rgba(59,130,246,.1) 0%, transparent 40%);
    animation: floatBackground 20s ease-in-out infinite;
}
.hero::after {
    content: "";
    position: absolute;
    inset: 0;
    background-image: radial-gradient(circle at 1px 1px, rgba(14,165,233,.3) 1px, transparent 0);
    background-size: 40px 40px;
    opacity: .1;
    mask: linear-gradient(to bottom, transparent 0%, black 20%, black 80%, transparent 100%);
}
@keyframes floatBackground {
    0%,100% {
        transform: translate(0,0) rotate(0deg);
    }
    33% {
        transform: translate(-10px,-20px) rotate(.5deg);
    }
    66% {
        transform: translate(10px,-10px) rotate(-.5deg);
    }
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
}
.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: .5rem;
    padding: .5rem 1rem;
    background: rgba(14,165,233,.1);
    border: 1px solid var(--border-accent);
    border-radius: 9999px;
    color: var(--primary);
    font-size: .85rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    backdrop-filter: blur(10px);
    animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse {
    0%, 100% {
       box-shadow: 0 0 0 0 rgba(14,165,233,.4);
    }
    50% {
        box-shadow: 0 0 0 10px rgba(14,165,233,0);
    }
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4.5rem);
    font-weight: 900;
    line-height: 1.1;
    margin-bottom: 1rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero-subtitle {
    font-size: clamp(1.25rem, 2.5vw, 1.75rem);
    color: var(--text-secondary);
    font-weight: 600;
    margin-bottom: 1rem;
}
.hero-description {
    font-size: 1.125rem;
    color: var(--text-muted);
    margin-bottom: 2rem;
    line-height: 1.8;
}
.hero-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.stats {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    padding: 3rem 0;
}
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    text-align: center;
}
.stat-item {
    padding: 1.5rem;
}
.stat-number {
    font-size: 2.5rem;
    font-weight: 900;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: block;
    margin-bottom: .5rem;
}
.stat-label {
    color: var(--text-secondary);
    font-weight: 600;
    font-size: .9rem;
    text-transform: uppercase;
    letter-spacing: .05em;
}

.certifications {
    padding: 6rem 0;
}
.section-header {
    text-align: center;
    margin-bottom: 4rem;
}
.section-badge {
    display: inline-block;
    padding: .5rem 1rem;
    background: rgba(139,92,246,.1);
    color: var(--accent);
    border: 1px solid rgba(139,92,246,.3);
    border-radius: 9999px;
    font-size: .85rem;
    font-weight: 600;
    margin-bottom: 1rem;
}
.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    margin-bottom: 1rem;
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.section-description {
    font-size: 1.125rem;
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto;
}

.certs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}
.cert-card {
    position: relative;
    padding: 1rem;
    overflow: hidden;
    transition: all var(--animation-slow);
}
.cert-card::before {
    content: "";
    position: absolute;
    inset: 0 auto 0 -100%;
    width: 100%;
    background: linear-gradient(90deg, transparent, rgba(14,165,233,.1), transparent);
    transition: left .8s ease;
}
.cert-card:hover::before {
    left: 100%;
}
.cert-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
    border-color: var(--border-accent);
}

.cert-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}
.cert-icon {
    width: 60px;
    height: 60px;
    background: var(--gradient-primary);
    border-radius: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 1.5rem;
    flex-shrink: 0;
}
.cert-info h3 {
    font-size: 1.375rem;
    font-weight: 700;
    margin-bottom: .25rem;
}
.cert-full-name {
    font-family: 'JetBrains Mono', monospace;
    font-size: .875rem;
    color: var(--text-muted);
}
.cert-description {
    color: var(--text-secondary);
    line-height: 1.7;
}

.experience {
    padding: 6rem 0;
    background: var(--bg-secondary);
}
.timeline {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
}
.timeline::before {
    content: "";
    position: absolute;
    left: 2rem;
    top: 0; bottom: 0;
    width: 2px;
    background: var(--gradient-primary);
}
.timeline-item {
    position: relative;
    padding-left: 5rem;
    margin-bottom: 3rem;
    padding-bottom: 2rem;
}
.timeline-item::before {
    content: "";
    position: absolute;
    left: 1.5rem;
    top: .5rem;
    width: 1rem;
    height: 1rem;
    background: var(--primary);
    border-radius: 50%;
    border: 3px solid var(--bg-secondary);
}
.timeline-card {
    padding: 2rem;
    position: relative;
    transition: all var(--animation-slow);
}
.timeline-card:hover {
    transform: translateX(10px);
    box-shadow: var(--shadow-lg);
    border-color: var(--border-accent);
}
.timeline-header {
    margin-bottom: 1rem;
}
.timeline-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: .5rem;
}
.timeline-subtitle {
    color: var(--text-secondary);
    font-weight: 600;
}
.timeline-description {
    color: var(--text-muted);
    line-height: 1.7;
}

.skills {
    padding: 6rem 0;
}
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}
.skill-card {
    padding: 2rem;
    text-align: center;
    position: relative;
    overflow: hidden;
    transition: all var(--animation-slow);
}
.skill-card::after {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transition: transform var(--animation-slow);
}
.skill-card:hover::after {
    transform: scaleX(1);
}
.skill-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
    border-color: var(--border-accent);
}
.skill-icon {
    width: 80px;
    height: 80px;
    background: var(--gradient-secondary);
    border-radius: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    color: #fff;
    font-size: 2rem;
}
.skill-title {
    font-size: 1.375rem;
    font-weight: 700;
    margin-bottom: 1rem;
}
.skill-description {
    color: var(--text-secondary);
    line-height: 1.7;
}

.projects {
    padding: 6rem 0;
    background: var(--bg-secondary);
}
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
    gap: 3rem;
}
.project-card {
    padding: 2.5rem;
    position: relative;
    overflow: hidden;
    transition: all var(--animation-slow);
}
.project-card::before {
    content: "";
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(14,165,233,.05), transparent);
    transition: left .8s ease;
}
.project-card:hover::before {
    left: 100%;
}
.project-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
    border-color: var(--border-accent);
}

.project-header {
    display: flex;
    align-items: flex-start;
    gap: 1.5rem;
    margin-bottom: 2rem;
}
.project-icon {
    width: 80px;
    height: 80px;
    border-radius: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 2rem;
    flex-shrink: 0;
}
.project-icon.minecraft {
    background:
    linear-gradient(135deg, #10b981, #059669);
}
.project-icon.cpp {
    background: var(--gradient-primary);
}
.project-info h3 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: .5rem;
}
.project-tech {
    font-family: 'JetBrains Mono', monospace;
    font-size: .875rem;
    color: var(--text-muted);
}
.project-description {
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 2rem;
}
.project-features {
    margin-bottom: 2rem;
}
.project-features h4 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}
.feature-list {
    list-style: none;
}
.feature-list li {
    color: var(--text-secondary);
    padding: .375rem 0 .375rem 1.5rem;
    position: relative;
}
.feature-list li::before {
    content: '→';
    position: absolute;
    left: 0; color: var(--primary);
    font-weight: 700;
}

.contact {
    padding: 6rem 0;
    text-align: center;
}
.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}
.contact-card {
    padding: 2rem;
    transition: all var(--animation-slow);
    text-align: center;
}
.contact-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--border-accent);
}
.contact-icon {
    width: 60px;
    height: 60px;
    background: var(--gradient-secondary);
    border-radius: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
    color: #fff;
    font-size: 1.5rem;
}
.contact-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: .5rem;
}
.contact-card a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--animation-normal);
}
.contact-card a:hover {
    color: var(--primary);
}

.idea {
    padding: .5rem 0 .25rem;
    border-bottom: 1px solid rgba(255,255,255,.08);
}
.idea:last-of-type {
    border-bottom: 0;
}
.idea-title {
    margin: 0 0 .25rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: .5rem;
}
.quote-lite {
    margin: .75rem 0 0;
    padding: .75rem 1rem;
    border: 1px solid rgba(255,255,255,.08);
    border-radius: 12px;
    background: rgba(255,255,255,.03);
    font-style: italic;
}
.modal {
    position: fixed;
    inset: 0;
    display: grid;
    place-items: center;
    background: rgba(0,0,0,.6);
    backdrop-filter: blur(4px);
    z-index: 9999;
}
.modal[hidden]{
    display: none;
}
.modal-card {
    background: var(--card, rgba(20,20,28,.8));
    border: 1px solid rgba(255,255,255,.08);
    border-radius: 16px; padding: 1.25rem;
    width: min(720px, 92vw);
}
.modal-actions {
    display: flex;
    gap: .5rem;
    justify-content: flex-end;
    margin-top: 1rem;
}
.options {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: .5rem 1rem;
    margin: .75rem 0;
}
@media (max-width: 560px) {
    .options {
        grid-template-columns: 1fr;
    }
}
.divider {
    border: 0;
    border-top: 1px solid rgba(255,255,255,.08);
    margin: 1rem 0;
}
.demo-shell {
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow, 0 8px 30px rgba(0,0,0,.2));
}

.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    padding: 2rem 0;
    display: flex;
    justify-content: center;
    align-items: center;
}
.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 2rem;
}
.footer-text {
    color: var(--text-muted);
}

::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}
::-webkit-scrollbar-track {
    background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
    background: var(--primary);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--primary-dark);
}

/* Firefox */
* {
    scrollbar-width: thin;
    scrollbar-color: var(--primary) var(--bg-primary);
}

@media (max-width: 768px) {
    .nav {
        display: none;
    }
    .mobile-menu-btn {
        display: block;
    }

    .hero {
        padding: 2rem 0; min-height: 90vh;
    }
    .hero-buttons {
        flex-direction: column;
    }
    .btn {
        justify-content: center;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr); gap: 1rem;
    }
    .certs-grid, .skills-grid {
        grid-template-columns: 1fr;
    }
    .projects-grid {
        grid-template-columns: 1fr;
    }

    .project-header {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
    .timeline::before {
        left: 1rem;
    }
    .timeline-item {
        padding-left: 3rem;
    }
    .timeline-item::before {
        left: .5rem;
    }

    .contact-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
  .container {
      padding: 0 1rem;
  }
  .hero-title {
      font-size: 2rem;
  }
  .section-title {
      font-size: 1.75rem;
  }
  .stats-grid, .contact-grid {
      grid-template-columns: 1fr;
  }
  .project-card, .cert-card, .skill-card {
      padding: 1.5rem;
  }
  .timeline-card {
      padding: 1.5rem;
  }
}

.loading {
    position: fixed;
    inset: 0;
    background: var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity .5s ease;
}
.loading.hidden {
    opacity: 0;
    pointer-events: none;
}
.loader {
    width: 50px;
    height: 50px;
    border: 3px solid rgba(14,165,233,.3);
    border-radius: 50%;
    border-top-color: var(--primary);
    animation: spin 1s ease-in-out infinite;
}
@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

section[id] {
    scroll-margin-top: calc(var(--header-height, 80px) + 20px);
}